<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>
	<style type="text/css">
#wu{
	width: 200px;
	height:200px;
	background: #3B96DC;
}
#qin{
	width: 200px;
	height: 200px;
	background:#66D9EF;
	margin: auto;
}
#jia{
	width: 200px;
	height:200px;
	background: #D7BEC7
}

	</style>

</head>
<body>
	<div id="wu">wu</div>
	<div id="qin">qin</div>
	<div id="jia">jia</div>
</body>
</html>